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Fishing Flatstone Lake: what the data says
155-acre lake near Ontario. The lake tops out around 45 ft. The contours are modeled from the water's real shoreline and maximum depth. Treat them as a rough guide, and never use them for navigation. What follows comes from the same scoring engine that paints the spots above.
Lake Trout fishing at Flatstone Lake
Start shallow in spring: lake trout sit in 10 to 40 ft that time of year. By summer they slide out to 14 to 45 ft, and by winter most fish are in 11 to 45 ft. If you only fish one area, make it Deep basin: a deep basin around 38 ft that scores prime in summer. In summer the feeding windows fall in early morning. A white tube jig (deep) or a magnum spoon on downrigger covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 10 to 40 ft | dawn & dusk | Casting spoon over shoals, Jerkbait (shallow) |
| Summer | 14 to 45 ft | dawn | White tube jig (deep), Magnum spoon on downrigger |
| Fall | 9 to 45 ft | dusk & dawn | Heavy casting spoon, Jigging rap over reefs |
| Winter | 11 to 45 ft | dawn | White tube jig, Airplane jig |
Rainbow Trout fishing at Flatstone Lake
Spring rainbow trout on Flatstone Lake hold shallow, usually 5 to 20 ft. By summer they slide out to 8 to 30 ft, and by winter most fish are in 8 to 40 ft. If you only fish one area, make it Break off the point: a drop-off around 20 ft that scores prime in winter. Best bite is early morning and the evening. Summer baits: a dodger + spoon (deep troll) or a flutter spoon gets it done.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 5 to 20 ft | dawn & dusk | Inline spinner (silver), Small spoon |
| Summer | 8 to 30 ft | dawn & dusk | Dodger + spoon (deep troll), Flutter spoon |
| Fall | 10 to 35 ft | dawn & dusk | Casting spoon, Jerkbait over shoals |
| Winter | 8 to 40 ft | dawn | Jigging spoon, Tube jig (white) |
Yellow Perch fishing at Flatstone Lake
Start shallow in spring: yellow perch sit in 3 to 12 ft that time of year. By summer they slide out to 10 to 30 ft, and by winter most fish are in 15 to 35 ft. If you only fish one area, make it Shallow bay flat: a weed flat around 5 ft that scores prime in spring. In summer the feeding windows fall in early morning. A drop-shot micro plastics or a small spoon tipped with worm covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 3 to 12 ft | midday & dawn | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 10 to 30 ft | dawn | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 12 to 35 ft | midday | Jigging spoon (small), Perch rig / spreader |
| Winter | 15 to 35 ft | midday & dawn | Tungsten jig + spikes, Rattle spoon (small) |
Rock Bass fishing at Flatstone Lake
Start shallow in spring: rock bass sit in 2 to 10 ft that time of year. Summer pushes them deeper, 5 to 20 ft, and winter fish settle into 12 to 30 ft. The spot to know is Main-lake point, a point in about 11 ft of water that rates prime for rock bass in summer. Plan around the evening in the warm months. A ned rig (small) or a marabou jig covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 2 to 10 ft | midday & dawn | 1/16 oz jig + grub, Small inline spinner |
| Summer | 5 to 20 ft | dusk | Ned rig (small), Marabou jig |
| Fall | 8 to 22 ft | midday | Small tube jig, Inline spinner |
| Winter | 12 to 30 ft | midday | Tungsten jig + plastic, Small spoon + spike |
Notable structure
- Deep basin: deep basin, around 38 ft
- Break off the point: drop-off, around 20 ft
- Main-lake point: point, around 11 ft
- Secondary point: point, around 11 ft
- Shallow bay flat: weed flat, around 5 ft
- Back-bay flat: weed flat, around 5 ft
Common questions
How deep is Flatstone Lake?
Flatstone Lake is about 45 ft at its deepest point. The contours here are modeled from the water's real shape and maximum depth, so treat them as a rough guide.
What fish are in Flatstone Lake?
Anglers target rainbow trout, yellow perch, lake trout, rock bass on Flatstone Lake.
Where is the best fishing spot on Flatstone Lake?
Deep basin is the top-rated area: a deep basin in about 38 ft of water that rates prime for lake trout in summer. Open the map above to see every rated spot for each species and season.
When is the best time to fish Flatstone Lake?
For lake trout, the summer bite is best in early morning. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Nearby waters
Sigs Lake · Lost L. · Leroy Lake · Babs Lake · Wigwam L. · Calcite Lake
See how Flatstone Lake stacks up: best rainbow trout lakes in Ontario · best yellow perch lakes in Ontario · best lake trout lakes in Ontario · best rock bass lakes in Ontario
Browse all Ontario fishing maps or every water on DepthScout. How we build these maps. For fishing guidance only, never navigation.